Re: [opennms-devel] Extending OpenNMS model without change opennms-model jar

On Fri, Jul 04, 2008 at 02:16:47PM -0430, Alejandro Galue wrote
> Spring people point to use JPA and persistence.xml, because it uses  
> automatic class adding with @Entity annotations but, neither found how  
> can use this with  AnnotationSessionFactoryBean.
> 
> Any suggestions ?
> 
> Alejandro.
>

Although JPA would be helpful if you were building a standalone
application, it might not be so helpful in context of openNMS as it is
not fesible to make OpenNMS and JPA work cleanly (afaik)

following chat log may help

----
<brozow>  	we use hibernate's 'Criteria' object to so some some query
building  	[08:19]
<brozow> 	and we use a few Hibernate specific annotations to cover
things that were not included in the jpa spec 	[08:19]
<geoaxis> 	i see 	[08:19]

<geoaxis> 	could you give me an example of some hibernate annotation
not included in JPA 	[08:21]
<brozow> 	sure 	[08:21]
*brozow goes to look 	[08:21]
<geoaxis> 	i meant : then use of JPA as some thing intermediate might
not be possible 	[08:21]

<brozow> 	jpa doesn't seem to provide a 'DELETE-ORPHAN' cascade
[08:24]
<brozow> 	in fact I don't remember that jpa does cascading delete at
all 	[08:24]
<geoaxis> 	brozow: let me check 	[08:25]
<brozow> 	cd opennms-model/src/main/java/org/opennms/netmgt/model;
grep hibernate\.annotation * 	[08:26]
<brozow> 	oh.. and the 'Where' annotation 	[08:27]
<brozow> 	as well as a few Collection type annotations 	[08:27]

And with JPA absent you will have to go to applicationContext-dao.xml to
add reference to your annotated classes.



-- 
Shahzada Hatim Mushtaq
Open Source Software Developer
http://hatimonline.com
geoaxis on irc.freenode.net
hatimonline on skype

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